This is makeindex, version 2.15 [TeX Live 2010] (kpathsea + Thai support).
Scanning input file manual.idx....
!! Input index error (file = manual.idx, line = 395):
   -- Illegal null field.
!! Input index error (file = manual.idx, line = 396):
   -- Illegal null field.
done (584 entries accepted, 2 rejected).
Sorting entries.......done (5999 comparisons).
Generating output file manual.ind....done (627 lines written, 0 warnings).
Output written in manual.ind.
Transcript written in manual.ilg.
